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| Current File : //usr/src/contrib/llvm/lib/Support/Windows/Path.inc |
//===- llvm/Support/Win32/Path.cpp - Win32 Path Implementation ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of the Path class.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Win32 code that
//=== is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//
#include "Windows.h"
#include <malloc.h>
#include <cstdio>
// We need to undo a macro defined in Windows.h, otherwise we won't compile:
#undef CopyFile
#undef GetCurrentDirectory
// Windows happily accepts either forward or backward slashes, though any path
// returned by a Win32 API will have backward slashes. As LLVM code basically
// assumes forward slashes are used, backward slashs are converted where they
// can be introduced into a path.
//
// Another invariant is that a path ends with a slash if and only if the path
// is a root directory. Any other use of a trailing slash is stripped. Unlike
// in Unix, Windows has a rather complicated notion of a root path and this
// invariant helps simply the code.
static void FlipBackSlashes(std::string& s) {
for (size_t i = 0; i < s.size(); i++)
if (s[i] == '\\')
s[i] = '/';
}
namespace llvm {
namespace sys {
const char PathSeparator = ';';
StringRef Path::GetEXESuffix() {
return "exe";
}
Path::Path(llvm::StringRef p)
: path(p) {
FlipBackSlashes(path);
}
Path::Path(const char *StrStart, unsigned StrLen)
: path(StrStart, StrLen) {
FlipBackSlashes(path);
}
Path&
Path::operator=(StringRef that) {
path.assign(that.data(), that.size());
FlipBackSlashes(path);
return *this;
}
bool
Path::isValid() const {
if (path.empty())
return false;
size_t len = path.size();
// If there is a null character, it and all its successors are ignored.
size_t pos = path.find_first_of('\0');
if (pos != std::string::npos)
len = pos;
// If there is a colon, it must be the second character, preceded by a letter
// and followed by something.
pos = path.rfind(':',len);
size_t rootslash = 0;
if (pos != std::string::npos) {
if (pos != 1 || !isalpha(path[0]) || len < 3)
return false;
rootslash = 2;
}
// Look for a UNC path, and if found adjust our notion of the root slash.
if (len > 3 && path[0] == '/' && path[1] == '/') {
rootslash = path.find('/', 2);
if (rootslash == std::string::npos)
rootslash = 0;
}
// Check for illegal characters.
if (path.find_first_of("\\<>\"|\001\002\003\004\005\006\007\010\011\012"
"\013\014\015\016\017\020\021\022\023\024\025\026"
"\027\030\031\032\033\034\035\036\037")
!= std::string::npos)
return false;
// Remove trailing slash, unless it's a root slash.
if (len > rootslash+1 && path[len-1] == '/')
path.erase(--len);
// Check each component for legality.
for (pos = 0; pos < len; ++pos) {
// A component may not end in a space.
if (path[pos] == ' ') {
if (pos+1 == len || path[pos+1] == '/' || path[pos+1] == '\0')
return false;
}
// A component may not end in a period.
if (path[pos] == '.') {
if (pos+1 == len || path[pos+1] == '/') {
// Unless it is the pseudo-directory "."...
if (pos == 0 || path[pos-1] == '/' || path[pos-1] == ':')
return true;
// or "..".
if (pos > 0 && path[pos-1] == '.') {
if (pos == 1 || path[pos-2] == '/' || path[pos-2] == ':')
return true;
}
return false;
}
}
}
return true;
}
void Path::makeAbsolute() {
TCHAR FullPath[MAX_PATH + 1] = {0};
LPTSTR FilePart = NULL;
DWORD RetLength = ::GetFullPathNameA(path.c_str(),
sizeof(FullPath)/sizeof(FullPath[0]),
FullPath, &FilePart);
if (0 == RetLength) {
// FIXME: Report the error GetLastError()
assert(0 && "Unable to make absolute path!");
} else if (RetLength > MAX_PATH) {
// FIXME: Report too small buffer (needed RetLength bytes).
assert(0 && "Unable to make absolute path!");
} else {
path = FullPath;
}
}
bool
Path::isAbsolute(const char *NameStart, unsigned NameLen) {
assert(NameStart);
// FIXME: This does not handle correctly an absolute path starting from
// a drive letter or in UNC format.
switch (NameLen) {
case 0:
return false;
case 1:
case 2:
return NameStart[0] == '/';
default:
return
(NameStart[0] == '/' || (NameStart[1] == ':' && NameStart[2] == '/')) ||
(NameStart[0] == '\\' || (NameStart[1] == ':' && NameStart[2] == '\\'));
}
}
bool
Path::isAbsolute() const {
// FIXME: This does not handle correctly an absolute path starting from
// a drive letter or in UNC format.
switch (path.length()) {
case 0:
return false;
case 1:
case 2:
return path[0] == '/';
default:
return path[0] == '/' || (path[1] == ':' && path[2] == '/');
}
}
static Path *TempDirectory;
Path
Path::GetTemporaryDirectory(std::string* ErrMsg) {
if (TempDirectory)
return *TempDirectory;
char pathname[MAX_PATH];
if (!GetTempPath(MAX_PATH, pathname)) {
if (ErrMsg)
*ErrMsg = "Can't determine temporary directory";
return Path();
}
Path result;
result.set(pathname);
// Append a subdirectory passed on our process id so multiple LLVMs don't
// step on each other's toes.
#ifdef __MINGW32__
// Mingw's Win32 header files are broken.
sprintf(pathname, "LLVM_%u", unsigned(GetCurrentProcessId()));
#else
sprintf(pathname, "LLVM_%u", GetCurrentProcessId());
#endif
result.appendComponent(pathname);
// If there's a directory left over from a previous LLVM execution that
// happened to have the same process id, get rid of it.
result.eraseFromDisk(true);
// And finally (re-)create the empty directory.
result.createDirectoryOnDisk(false);
TempDirectory = new Path(result);
return *TempDirectory;
}
// FIXME: the following set of functions don't map to Windows very well.
Path
Path::GetRootDirectory() {
// This is the only notion that that Windows has of a root directory. Nothing
// is here except for drives.
return Path("file:///");
}
void
Path::GetSystemLibraryPaths(std::vector<sys::Path>& Paths) {
char buff[MAX_PATH];
// Generic form of C:\Windows\System32
HRESULT res = SHGetFolderPathA(NULL,
CSIDL_FLAG_CREATE | CSIDL_SYSTEM,
NULL,
SHGFP_TYPE_CURRENT,
buff);
if (res != S_OK) {
assert(0 && "Failed to get system directory");
return;
}
Paths.push_back(sys::Path(buff));
// Reset buff.
buff[0] = 0;
// Generic form of C:\Windows
res = SHGetFolderPathA(NULL,
CSIDL_FLAG_CREATE | CSIDL_WINDOWS,
NULL,
SHGFP_TYPE_CURRENT,
buff);
if (res != S_OK) {
assert(0 && "Failed to get windows directory");
return;
}
Paths.push_back(sys::Path(buff));
}
void
Path::GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths) {
char * env_var = getenv("LLVM_LIB_SEARCH_PATH");
if (env_var != 0) {
getPathList(env_var,Paths);
}
#ifdef LLVM_LIBDIR
{
Path tmpPath;
if (tmpPath.set(LLVM_LIBDIR))
if (tmpPath.canRead())
Paths.push_back(tmpPath);
}
#endif
GetSystemLibraryPaths(Paths);
}
Path
Path::GetUserHomeDirectory() {
char buff[MAX_PATH];
HRESULT res = SHGetFolderPathA(NULL,
CSIDL_FLAG_CREATE | CSIDL_APPDATA,
NULL,
SHGFP_TYPE_CURRENT,
buff);
if (res != S_OK)
assert(0 && "Failed to get user home directory");
return Path(buff);
}
Path
Path::GetCurrentDirectory() {
char pathname[MAX_PATH];
::GetCurrentDirectoryA(MAX_PATH,pathname);
return Path(pathname);
}
/// GetMainExecutable - Return the path to the main executable, given the
/// value of argv[0] from program startup.
Path Path::GetMainExecutable(const char *argv0, void *MainAddr) {
char pathname[MAX_PATH];
DWORD ret = ::GetModuleFileNameA(NULL, pathname, MAX_PATH);
return ret != MAX_PATH ? Path(pathname) : Path();
}
// FIXME: the above set of functions don't map to Windows very well.
StringRef Path::getDirname() const {
return getDirnameCharSep(path, "/");
}
StringRef
Path::getBasename() const {
// Find the last slash
size_t slash = path.rfind('/');
if (slash == std::string::npos)
slash = 0;
else
slash++;
size_t dot = path.rfind('.');
if (dot == std::string::npos || dot < slash)
return StringRef(path).substr(slash);
else
return StringRef(path).substr(slash, dot - slash);
}
StringRef
Path::getSuffix() const {
// Find the last slash
size_t slash = path.rfind('/');
if (slash == std::string::npos)
slash = 0;
else
slash++;
size_t dot = path.rfind('.');
if (dot == std::string::npos || dot < slash)
return StringRef("");
else
return StringRef(path).substr(dot + 1);
}
bool
Path::exists() const {
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::isDirectory() const {
DWORD attr = GetFileAttributes(path.c_str());
return (attr != INVALID_FILE_ATTRIBUTES) &&
(attr & FILE_ATTRIBUTE_DIRECTORY);
}
bool
Path::isSymLink() const {
DWORD attributes = GetFileAttributes(path.c_str());
if (attributes == INVALID_FILE_ATTRIBUTES)
// There's no sane way to report this :(.
assert(0 && "GetFileAttributes returned INVALID_FILE_ATTRIBUTES");
// This isn't exactly what defines a NTFS symlink, but it is only true for
// paths that act like a symlink.
return attributes & FILE_ATTRIBUTE_REPARSE_POINT;
}
bool
Path::canRead() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::canWrite() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return (attr != INVALID_FILE_ATTRIBUTES) && !(attr & FILE_ATTRIBUTE_READONLY);
}
bool
Path::canExecute() const {
// FIXME: take security attributes into account.
DWORD attr = GetFileAttributes(path.c_str());
return attr != INVALID_FILE_ATTRIBUTES;
}
bool
Path::isRegularFile() const {
bool res;
if (fs::is_regular_file(path, res))
return false;
return res;
}
StringRef
Path::getLast() const {
// Find the last slash
size_t pos = path.rfind('/');
// Handle the corner cases
if (pos == std::string::npos)
return path;
// If the last character is a slash, we have a root directory
if (pos == path.length()-1)
return path;
// Return everything after the last slash
return StringRef(path).substr(pos+1);
}
const FileStatus *
PathWithStatus::getFileStatus(bool update, std::string *ErrStr) const {
if (!fsIsValid || update) {
WIN32_FILE_ATTRIBUTE_DATA fi;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi)) {
MakeErrMsg(ErrStr, "getStatusInfo():" + std::string(path) +
": Can't get status: ");
return 0;
}
status.fileSize = fi.nFileSizeHigh;
status.fileSize <<= sizeof(fi.nFileSizeHigh)*8;
status.fileSize += fi.nFileSizeLow;
status.mode = fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY ? 0555 : 0777;
status.user = 9999; // Not applicable to Windows, so...
status.group = 9999; // Not applicable to Windows, so...
// FIXME: this is only unique if the file is accessed by the same file path.
// How do we do this for C:\dir\file and ..\dir\file ? Unix has inode
// numbers, but the concept doesn't exist in Windows.
status.uniqueID = 0;
for (unsigned i = 0; i < path.length(); ++i)
status.uniqueID += path[i];
ULARGE_INTEGER ui;
ui.LowPart = fi.ftLastWriteTime.dwLowDateTime;
ui.HighPart = fi.ftLastWriteTime.dwHighDateTime;
status.modTime.fromWin32Time(ui.QuadPart);
status.isDir = fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
fsIsValid = true;
}
return &status;
}
bool Path::makeReadableOnDisk(std::string* ErrMsg) {
// All files are readable on Windows (ignoring security attributes).
return false;
}
bool Path::makeWriteableOnDisk(std::string* ErrMsg) {
DWORD attr = GetFileAttributes(path.c_str());
// If it doesn't exist, we're done.
if (attr == INVALID_FILE_ATTRIBUTES)
return false;
if (attr & FILE_ATTRIBUTE_READONLY) {
if (!SetFileAttributes(path.c_str(), attr & ~FILE_ATTRIBUTE_READONLY)) {
MakeErrMsg(ErrMsg, std::string(path) + ": Can't make file writable: ");
return true;
}
}
return false;
}
bool Path::makeExecutableOnDisk(std::string* ErrMsg) {
// All files are executable on Windows (ignoring security attributes).
return false;
}
bool
Path::getDirectoryContents(std::set<Path>& result, std::string* ErrMsg) const {
WIN32_FILE_ATTRIBUTE_DATA fi;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi)) {
MakeErrMsg(ErrMsg, path + ": can't get status of file");
return true;
}
if (!(fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
if (ErrMsg)
*ErrMsg = path + ": not a directory";
return true;
}
result.clear();
WIN32_FIND_DATA fd;
std::string searchpath = path;
if (path.size() == 0 || searchpath[path.size()-1] == '/')
searchpath += "*";
else
searchpath += "/*";
HANDLE h = FindFirstFile(searchpath.c_str(), &fd);
if (h == INVALID_HANDLE_VALUE) {
if (GetLastError() == ERROR_FILE_NOT_FOUND)
return true; // not really an error, now is it?
MakeErrMsg(ErrMsg, path + ": Can't read directory: ");
return true;
}
do {
if (fd.cFileName[0] == '.')
continue;
Path aPath(path);
aPath.appendComponent(&fd.cFileName[0]);
result.insert(aPath);
} while (FindNextFile(h, &fd));
DWORD err = GetLastError();
FindClose(h);
if (err != ERROR_NO_MORE_FILES) {
SetLastError(err);
MakeErrMsg(ErrMsg, path + ": Can't read directory: ");
return true;
}
return false;
}
bool
Path::set(StringRef a_path) {
if (a_path.empty())
return false;
std::string save(path);
path = a_path;
FlipBackSlashes(path);
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::appendComponent(StringRef name) {
if (name.empty())
return false;
std::string save(path);
if (!path.empty()) {
size_t last = path.size() - 1;
if (path[last] != '/')
path += '/';
}
path += name;
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::eraseComponent() {
size_t slashpos = path.rfind('/',path.size());
if (slashpos == path.size() - 1 || slashpos == std::string::npos)
return false;
std::string save(path);
path.erase(slashpos);
if (!isValid()) {
path = save;
return false;
}
return true;
}
bool
Path::eraseSuffix() {
size_t dotpos = path.rfind('.',path.size());
size_t slashpos = path.rfind('/',path.size());
if (dotpos != std::string::npos) {
if (slashpos == std::string::npos || dotpos > slashpos+1) {
std::string save(path);
path.erase(dotpos, path.size()-dotpos);
if (!isValid()) {
path = save;
return false;
}
return true;
}
}
return false;
}
inline bool PathMsg(std::string* ErrMsg, const char* pathname, const char*msg) {
if (ErrMsg)
*ErrMsg = std::string(pathname) + ": " + std::string(msg);
return true;
}
bool
Path::createDirectoryOnDisk(bool create_parents, std::string* ErrMsg) {
// Get a writeable copy of the path name
size_t len = path.length();
char *pathname = reinterpret_cast<char *>(_alloca(len+2));
path.copy(pathname, len);
pathname[len] = 0;
// Make sure it ends with a slash.
if (len == 0 || pathname[len - 1] != '/') {
pathname[len] = '/';
pathname[++len] = 0;
}
// Determine starting point for initial / search.
char *next = pathname;
if (pathname[0] == '/' && pathname[1] == '/') {
// Skip host name.
next = strchr(pathname+2, '/');
if (next == NULL)
return PathMsg(ErrMsg, pathname, "badly formed remote directory");
// Skip share name.
next = strchr(next+1, '/');
if (next == NULL)
return PathMsg(ErrMsg, pathname,"badly formed remote directory");
next++;
if (*next == 0)
return PathMsg(ErrMsg, pathname, "badly formed remote directory");
} else {
if (pathname[1] == ':')
next += 2; // skip drive letter
if (*next == '/')
next++; // skip root directory
}
// If we're supposed to create intermediate directories
if (create_parents) {
// Loop through the directory components until we're done
while (*next) {
next = strchr(next, '/');
*next = 0;
if (!CreateDirectory(pathname, NULL) &&
GetLastError() != ERROR_ALREADY_EXISTS)
return MakeErrMsg(ErrMsg,
std::string(pathname) + ": Can't create directory: ");
*next++ = '/';
}
} else {
// Drop trailing slash.
pathname[len-1] = 0;
if (!CreateDirectory(pathname, NULL) &&
GetLastError() != ERROR_ALREADY_EXISTS) {
return MakeErrMsg(ErrMsg, std::string(pathname) +
": Can't create directory: ");
}
}
return false;
}
bool
Path::createFileOnDisk(std::string* ErrMsg) {
// Create the file
HANDLE h = CreateFile(path.c_str(), GENERIC_WRITE, 0, NULL, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE)
return MakeErrMsg(ErrMsg, path + ": Can't create file: ");
CloseHandle(h);
return false;
}
bool
Path::eraseFromDisk(bool remove_contents, std::string *ErrStr) const {
WIN32_FILE_ATTRIBUTE_DATA fi;
if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
return true;
if (fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
// If it doesn't exist, we're done.
bool Exists;
if (fs::exists(path, Exists) || !Exists)
return false;
char *pathname = reinterpret_cast<char *>(_alloca(path.length()+3));
int lastchar = path.length() - 1 ;
path.copy(pathname, lastchar+1);
// Make path end with '/*'.
if (pathname[lastchar] != '/')
pathname[++lastchar] = '/';
pathname[lastchar+1] = '*';
pathname[lastchar+2] = 0;
if (remove_contents) {
WIN32_FIND_DATA fd;
HANDLE h = FindFirstFile(pathname, &fd);
// It's a bad idea to alter the contents of a directory while enumerating
// its contents. So build a list of its contents first, then destroy them.
if (h != INVALID_HANDLE_VALUE) {
std::vector<Path> list;
do {
if (strcmp(fd.cFileName, ".") == 0)
continue;
if (strcmp(fd.cFileName, "..") == 0)
continue;
Path aPath(path);
aPath.appendComponent(&fd.cFileName[0]);
list.push_back(aPath);
} while (FindNextFile(h, &fd));
DWORD err = GetLastError();
FindClose(h);
if (err != ERROR_NO_MORE_FILES) {
SetLastError(err);
return MakeErrMsg(ErrStr, path + ": Can't read directory: ");
}
for (std::vector<Path>::iterator I = list.begin(); I != list.end();
++I) {
Path &aPath = *I;
aPath.eraseFromDisk(true);
}
} else {
if (GetLastError() != ERROR_FILE_NOT_FOUND)
return MakeErrMsg(ErrStr, path + ": Can't read directory: ");
}
}
pathname[lastchar] = 0;
if (!RemoveDirectory(pathname))
return MakeErrMsg(ErrStr,
std::string(pathname) + ": Can't destroy directory: ");
return false;
} else {
// Read-only files cannot be deleted on Windows. Must remove the read-only
// attribute first.
if (fi.dwFileAttributes & FILE_ATTRIBUTE_READONLY) {
if (!SetFileAttributes(path.c_str(),
fi.dwFileAttributes & ~FILE_ATTRIBUTE_READONLY))
return MakeErrMsg(ErrStr, path + ": Can't destroy file: ");
}
if (!DeleteFile(path.c_str()))
return MakeErrMsg(ErrStr, path + ": Can't destroy file: ");
return false;
}
}
bool Path::getMagicNumber(std::string& Magic, unsigned len) const {
assert(len < 1024 && "Request for magic string too long");
char* buf = reinterpret_cast<char*>(alloca(len));
HANDLE h = CreateFile(path.c_str(),
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (h == INVALID_HANDLE_VALUE)
return false;
DWORD nRead = 0;
BOOL ret = ReadFile(h, buf, len, &nRead, NULL);
CloseHandle(h);
if (!ret || nRead != len)
return false;
Magic = std::string(buf, len);
return true;
}
bool
Path::renamePathOnDisk(const Path& newName, std::string* ErrMsg) {
if (!MoveFileEx(path.c_str(), newName.c_str(), MOVEFILE_REPLACE_EXISTING))
return MakeErrMsg(ErrMsg, "Can't move '" + path + "' to '" + newName.path
+ "': ");
return false;
}
bool
Path::setStatusInfoOnDisk(const FileStatus &si, std::string *ErrMsg) const {
// FIXME: should work on directories also.
if (!si.isFile) {
return true;
}
HANDLE h = CreateFile(path.c_str(),
FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (h == INVALID_HANDLE_VALUE)
return true;
BY_HANDLE_FILE_INFORMATION bhfi;
if (!GetFileInformationByHandle(h, &bhfi)) {
DWORD err = GetLastError();
CloseHandle(h);
SetLastError(err);
return MakeErrMsg(ErrMsg, path + ": GetFileInformationByHandle: ");
}
ULARGE_INTEGER ui;
ui.QuadPart = si.modTime.toWin32Time();
FILETIME ft;
ft.dwLowDateTime = ui.LowPart;
ft.dwHighDateTime = ui.HighPart;
BOOL ret = SetFileTime(h, NULL, &ft, &ft);
DWORD err = GetLastError();
CloseHandle(h);
if (!ret) {
SetLastError(err);
return MakeErrMsg(ErrMsg, path + ": SetFileTime: ");
}
// Best we can do with Unix permission bits is to interpret the owner
// writable bit.
if (si.mode & 0200) {
if (bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY) {
if (!SetFileAttributes(path.c_str(),
bhfi.dwFileAttributes & ~FILE_ATTRIBUTE_READONLY))
return MakeErrMsg(ErrMsg, path + ": SetFileAttributes: ");
}
} else {
if (!(bhfi.dwFileAttributes & FILE_ATTRIBUTE_READONLY)) {
if (!SetFileAttributes(path.c_str(),
bhfi.dwFileAttributes | FILE_ATTRIBUTE_READONLY))
return MakeErrMsg(ErrMsg, path + ": SetFileAttributes: ");
}
}
return false;
}
bool
CopyFile(const sys::Path &Dest, const sys::Path &Src, std::string* ErrMsg) {
// Can't use CopyFile macro defined in Windows.h because it would mess up the
// above line. We use the expansion it would have in a non-UNICODE build.
if (!::CopyFileA(Src.c_str(), Dest.c_str(), false))
return MakeErrMsg(ErrMsg, "Can't copy '" + Src.str() +
"' to '" + Dest.str() + "': ");
return false;
}
bool
Path::makeUnique(bool reuse_current, std::string* ErrMsg) {
bool Exists;
if (reuse_current && (fs::exists(path, Exists) || !Exists))
return false; // File doesn't exist already, just use it!
// Reserve space for -XXXXXX at the end.
char *FNBuffer = (char*) alloca(path.size()+8);
unsigned offset = path.size();
path.copy(FNBuffer, offset);
// Find a numeric suffix that isn't used by an existing file. Assume there
// won't be more than 1 million files with the same prefix. Probably a safe
// bet.
static int FCounter = -1;
if (FCounter < 0) {
// Give arbitrary initial seed.
// FIXME: We should use sys::fs::unique_file() in future.
LARGE_INTEGER cnt64;
DWORD x = GetCurrentProcessId();
x = (x << 16) | (x >> 16);
if (QueryPerformanceCounter(&cnt64)) // RDTSC
x ^= cnt64.HighPart ^ cnt64.LowPart;
FCounter = x % 1000000;
}
do {
sprintf(FNBuffer+offset, "-%06u", FCounter);
if (++FCounter > 999999)
FCounter = 0;
path = FNBuffer;
} while (!fs::exists(path, Exists) && Exists);
return false;
}
bool
Path::createTemporaryFileOnDisk(bool reuse_current, std::string* ErrMsg) {
// Make this into a unique file name
makeUnique(reuse_current, ErrMsg);
// Now go and create it
HANDLE h = CreateFile(path.c_str(), GENERIC_WRITE, 0, NULL, CREATE_NEW,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE)
return MakeErrMsg(ErrMsg, path + ": can't create file");
CloseHandle(h);
return false;
}
/// MapInFilePages - Not yet implemented on win32.
const char *Path::MapInFilePages(int FD, size_t FileSize, off_t Offset) {
return 0;
}
/// MapInFilePages - Not yet implemented on win32.
void Path::UnMapFilePages(const char *Base, size_t FileSize) {
assert(0 && "NOT IMPLEMENTED");
}
}
}